Commit 1a2dcff8 authored Jul 24, 2019 by Halil Pasic Committed by Heiko Carstens Jul 26, 2019

s390/dma: provide proper ARCH_ZONE_DMA_BITS value

On s390 ZONE_DMA is up to 2G, i.e. ARCH_ZONE_DMA_BITS should be 31 bits.
The current value is 24 and makes __dma_direct_alloc_pages() take a
wrong turn first (but __dma_direct_alloc_pages() recovers then).

Let's correct ARCH_ZONE_DMA_BITS value and avoid wrong turns.

Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
Reported-by: Petr Tesarik <ptesarik@suse.cz>
Fixes: c61e9637 ("dma-direct: add support for allocation from ZONE_DMA and ZONE_DMA32")
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

parent 9779048d

arch/s390/include/asm/page.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -177,6 +177,8 @@ static inline int devmem_is_allowed(unsigned long pfn)
		#define VM_DATA_DEFAULT_FLAGS (VM_READ \| VM_WRITE \| \
		VM_MAYREAD \| VM_MAYWRITE \| VM_MAYEXEC)

		#define ARCH_ZONE_DMA_BITS 31

		#include <asm-generic/memory_model.h>
		#include <asm-generic/getorder.h>